|
Slim 22.5-mm Design Features Two SPDT
Relay Outputs
Provides individual over
voltage and under voltage settings and outputs
Single-phase / 3-phase Power Supply
Many customers require the individual upper and lower limit outputs that
are normally available only in larger 45-mm relays. For the first time
from any manufacturer, OMRON has achieved this and more in a slim-body
design measuring just 22.5 mm. These relays not only offer advantages such
as 3-phase power supply compatibility and a resistive load contact
capacity of 6 A at 250 VAC, but they also reduce panel production cost
because they use 50% less space than previous models.
Pre-alarm Monitoring Mode Provides
Advanced Warning (K8AB-VW Only)
In plants and other sites that operate 365 days a year, unexpected
shutdowns must be kept to an absolute minimum. OMRON addresses this with
the K8AB-VW featuring a two-level pre-alarm monitoring mode with
individual trip outputs and pre-alarm warning settings (H/HH alarm and
L/LL alarm). The K8AB-VW makes scheduled maintenance viable because the
pre-alarm monitoring mode provides advance warning of impending trip
alarms.
Expanded Setting Range Ensures Over
Voltage and Under Voltage Monitoring Flexibility
The highly restrictive voltage settings that
posed such a problem in the past are no longer a concern. OMRON's new
Relays offer full-span over voltage and under voltage range settings for
unprecedented voltage monitoring flexibility.
Usable as a Simple Sensor
Controller
Accepts inputs of 4 to 20 mA or 0 to 10 V.
Compatible with Commercial CTs
The K8AB-AS Single-Phase Current Relay can be used with commercial CTs for
current measurement.
|
|
CT current on secondary
side |
Applicable model |
|
Commercial CTs |
0 to 1 A AC |
K8AB-AS2 |
|
0 to 5 A AC |
Note: Omron-compatible CT: K8AC-CT200L, only
the K8AB-AS3 can be used for AC operation at both 100 and 200 A.
DIP Switch Function Selection
Various relay functions can be selected using a DIP switch. This means
that the number of models required can be reduced to 1/8 what it had been
simply by installing a relay like the K8AB-AS. An added advantage is that
it reduces the inventory of maintenance parts.
Single K8AB Monitors 3-phase Power
Supply with 3 or 4 Wires
OMRON Low-voltage Monitoring Relays can be
used to monitor 3-phase power supplies with 3 or 4 wires simply by
changing DIP switch settings.
Operation Level Indication by
Flashing Alarm Indicator
 
Checking the operating status has never been
convenient because of the time it takes to reach the preset operation
time. The K8AB eliminates this problem by featuring a flashing alarm
indicator that clearly indicates the operating status. This has greatly
simplified the task of checking on-site status particularly when operation
settings are changed or an error occurs.
Ideal for Monitoring Current
or Voltage
Current Monitoring
Applications (Single Phase)
|
Application |
Measured current |
Applicable models |
Operating value setting range |
|
Simple Sensor Controller
|
4 to 20 mA DC |
K8AB-AS1 |
2 to 20 mA AC/DC |
|
10 to 100 mA AC/DC |
|
50 to 500 mA AC/DC |
|
Process control signal monitoring (using
a commercial CT) |
0 to 1 A AC
5 to 5 A AC |
K8AB-AS2 |
0.1 to 1 A AC/DC |
|
0.5 to 5 A AC/DC |
|
0.8 to 8 A AC/DC |
|
Current monitoring for motors and
heaters (using a special CT) |
0 to 200 A AC |
K8AB-AS3 (see note.) |
--- |
|
10 to 100 A AC/DC |
|
20 to 200 A AC/DC |
Note: Special CT model: OMRON K8AC-CT200L.
|
OMRON IA Global
